Heating system of large-scale pure condensing-type steam turbine generator set and heating method

Abstract

The invention discloses a heating system of a large-scale pure condensing-type steam turbine generator set and a heating method. The heating system of the large-scale pure condensing-type steam turbine generator set comprises two high-pressure steam extraction pipelines, a steam mixer, a pressure matcher, two low-pressure steam extraction pipelines, a steam supply header, a high-pressure cylinder,a medium-pressure cylinder and a low-pressure cylinder; the cold section and hot section of a boiler reheater are connected to the steam mixer through two high-pressure steam extraction pipelines respectively, the situation that the overtemperature or excessively-low temperature phenomenon of the boiler reheater is caused by single steam extraction from the cold section or hot section of the boiler reheater is avoided, and meanwhile the problems are solved that due to the single steam extraction from the cold section or hot section of the boiler reheater, the steam feeding and discharging amount of a steam turbine is unbalanced, and the axial force change of a rotor of the steam turbine is large, and the safety of the steam turbine is endangered; the combined steam extraction is achievedthrough the two high-pressure steam extraction pipelines, so that when the steam supply temperature does not meet the steam supply temperature requirement due to the steam extraction of the cold section of the boiler reheater, the effect of increasing the steam supply temperature can be achieved by increasing the steam supply ratio of the hot section of the boiler reheater.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation equipment, and in particular relates to a heat supply system and a heat supply method for a large-scale pure condensing steam turbine generator set. Background technique [0002] Energy saving and emission reduction require central heating to close scattered coal-fired small boilers. The main measure to achieve central heating is to transform large-scale pure condensing steam turbine generator sets. One large generating set can satisfy multiple heat users. The production steam demand of the enterprise. Domestically, pure condensing steam generating units have been carried out for the transformation and application of heating technology. [0003] In a traditional large-scale pure condensing steam turbine generator set, the high-pressure cylinder, medium-pressure cylinder and low-pressure cylinder are sequentially connected on the same axis through their respective rotors; the boil...

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Problems solved by technology

However, the modified heating systems mentioned in these documents are not comprehensive, and focus on the introduction of the application of a single device, the heating steam pressure and temperature adjustment are not flexible enough, the heat supply is limited by the operating mode of the unit, and the unit load requirements are relatively high

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